| 摘要 |
PROBLEM TO BE SOLVED: To reduce meandering quantity of a belt without using any special part. SOLUTION: A belt device is provided with the following means: A calculation means for a deflection around of width direction belt positions to detect a deflection amount Bs of width direction belt positions between a width direction belt detecting position B0 and a width direction belt base position Ba of the belt supported by an alignment adjustment roller 27, a determination means for motor rotating position for control of positional holding time rate to determineθi,θi+1 when the rotating position of a stepping motor is made to beθi, which is determined for each one step of rotation from the rotating positionθ0 in detection of a detecting position B0, a calculation means for positional holding time rate to calculate positional holding time rate to hold the belt B on the base position Ba, a motor rotational position adjustment signal output means to output holding signals toθi orθi+1 alternately in accordance with the positional holding time rate, and a belt position adjustment device to adjust the tilted angle of a roller shaft 27a of the roller 27 by adjusting the motor rotation position in accordance with the output of the rotational position adjustment signal. |
